Loved the place, and the location is just spot on. ! I extended my stay several times due to how homely the place felt.
The apartment has everything you need to have a very comfortable stay, and situated minutes away from Asok MRT and BTS you've got a good gateway to all of Bangkok at your doorstop.
The hosts went out of there way to ensure any questions I had were answered and were quick to respond and keep me informed (as the place is new, there was some final stages if building work going on one day)
Soi 12 is a great little Soi, quiet but well located, with not only the street foods vendors making an appearance, but also a decent coffee shop, 2 established massage parlours and of course the famous Cabbages and Condoms restaurant (which is a definite must to try the food and learn more about). Being above C&C, there's a slight VIP delight walking in and out of the apartment each time!
That said, if you require a late night meal, the Little Korean town at the beginning has restaurants open all sorts of hours, or if more simple, the 7-11 there too. There's a lot of talk of food in this review, but this is Thailand....and being near good food is always a must :-)